Configuring the ROI

Region of Interest (ROI) indicates the detection area of an algorithm. Some algorithms require JSON strings indicating the detection area, for example, {"polygons":[{"data":[[84,389], [1840,349], [1824,526], [78,526]]}]}, where [84,389] indicates the horizontal and vertical coordinates, {"data":[...]} indicates a graph formed by connection lines of these coordinate points, and "polygons":[...]} indicates that multiple {"data":[...]} graphs are polygonal areas. The entire string example represents a polygonal area formed by the four coordinate points. Similarly, {"lines":[{"data":[[238,481], [1309,481]]}]} indicates a line segment formed by two coordinate points.

You can also draw an ROI. The platform automatically generates JSON strings indicating a detection area based on the drawing.

1. • To draw a straight-line segment, click .
     Figure 1 Drawing a straight-line segment
     
   • To draw a polygon, click . You do not need to draw the final line segment as it will be automatically completed when you double-click the mouse.
     Figure 2 Drawing a polygon
     
     

     • Make sure that the line segments of your polygon do not overlap while drawing it.
     • You can draw multiple polygons in a graph.
     • You can customize the name and color next to drawing area.